What was found
LT ENG STRAINER CLOGGED, LIGHT CAME ON IN FLIGHT IAW QRH REDUCED POWER-LIGHT REMAINED ILLUMINATED. DEFERED TO KHRL. UPON FILTER REMOVAL MX FOUND FILTER SCREEN FILLED WITH CARBON DEPOSITS. REPLACED LT ENG IAW AMM, AND MFG S/B NR 238 RECOMENDATIONS, OPS CHECKED ENG IAW AMM. CLOGGED FILTER LIGHT EXTINGUISHED, ALL PARAMETERS NORMAL. A MMC WAS ISSUED TO HAVE NR1 ENG MAIN OIL FILTER REPLACED WITHIN 25 FLIGHT HOURS. NOTE: TAT 38218, TAC 39869 FILTER CHANGE NOT TO EXCEED 38243 TAT.